“What the deuce?” is closely associated with Stewie Griffin, the precocious baby from the animated television comedy Family Guy. The series premiered in 1999, and Stewie’s formal vocabulary and British-accented speech helped make expressions like this part of his comic identity. Short recordings of the line later circulated through soundboards, video edits, and reaction posts. It remains useful because the delivery communicates confusion almost instantly, while the unusually old-fashioned wording gives an ordinary surprised response a distinctly Stewie-like comic edge.